Armagh;
Observatory,;
College;
Hill,;
Armagh;
BT61;
9DG,;
N.;
Ireland;
Centre;
for;
Astrophysics,;
University;
of;
Central;
Lancashire,;
Preston,;
UK;
Space;
Science;
Division,;
Naval;
Research;
Laboratory,;
Washington,;
DC;
20375,;
USA;
George;
Mason;
University,;
4400;
University;
Drive,;
Fairfax,;
VA;
22020,;
USA;
Department;
of;
Physics;
&;
Electronics,;
Deen;
Dayal;
Upadhyaya;
College,;
University;
of;
Delhi,;
India;
Department;
of;
Physics,;
University;
of;
Strathclyde,;
107;
Rottenrow,;
Glasgow,;
G4;
ONG,;
Scotland;
Columbia;
Astrophysics;
Laboratory,;
550;
W;
120th;
St,;
New;
York,;
NY;
10027,;
USA;